jones



(No Model.) 2 Sheets.Shet 1.

' E. P. JONES. ORB GRUSHING MACHINE.

No. 563,181. Patented June 30, 1896.

o W W m l I P I 2 E Rm Hf w G C I o I I m S s E w w 'WFW A TTORNE Y.

ANDREW BYGRAHAM. PNUTD-UTNQWASN INGIUN, U C

(No Model.) 2 Sheets-Shet 2'.

E. P. JONES. ORE GR'USHING MAGHINE. No. 563,181. Patented June 30, 1896.

fly. 4.

A TTOHNEY.

ANDREW B GRAHAM. PHUTO-UTHQWASHI NGTOILD C UNITED STATES PATENT OFFICE.

EDIVARDS P. JONES, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE RISDONIRON AND LOCOMOTIVE \VORKS, OF SAME PLACE.

' ORE-CRU SHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 583,181, dated June 30,1896.

Application filed September 24,1895. Serial No. 563 ,548. (No model.)

To all whom it may concern:

Be it known that I, EDWARDS P. J ONES, a citizen of the United States,residing in the city and co unty of San Francisco, State of California,have invented certain new and useful Improvements in Machines forCrushing Ore; and I hereby declare the following specification and thedrawings therewith to be a complete description of my improvements,together with the manner of constructing and applying the same.

My invention relates to that class of orecrushing machines in which theoperation is performed in flaring pans, or those of a conical form,embracing various modifications, of which the Chilian mill is typical.

My improvements consist in so constructing the discharge-screens thatform a portion of the flaring or conical walls of the pan that thesescreens can be inverted and reversed, so as to present, after wearing inone position, a new surface to withstand the abrasive action of the oreor sand as it is thrown outward by the crushing mechanism.

The object of my invention is to attain a double or greatly-increasedendurance of the screens, the wear of which forms a considerable part ofthe expense in crushing quartz or other silicious material.

The screens employed to prevent the escape of the material from crushingor pulverizing machines consist of thin perforated sheets of metal orwebs of woven wire, having meshes the size of which are commonlyexpressed by the number of perforations in one inch of length or width,as for example forty, sixty, or eighty mesh screens. These screens, ofwhatever material or construction, are thin, subjected to rapid abrasivewear on the inside next the crushing mechanism, and such wear occursprincipally in one plane corresponding to the top of the dies, or thesurfaces between which the crushing is done, and as this plane iscommonly below the horizontal center of the screen, a double service, ora greatly-increased service, is attained by reversing the screens whenworn in their first position. This is easily done When the screens aremounted on a flat surface, as in the case of common stampbatteries, butfor application on a flaring or conical surface such reversal of thescreens calls for special appliances and devices which form the subjectof my invention. These devices are shown in the accompanying drawings,in which Figure 1 is a plan view of an ore-crushing machine providedwith my improvements. Fig. 2 is a side elevation of the same machine.Fig. 3 is a Hat View of one of the wire screens such as is employed forthe machine shown in Figs. 1 and 2. Fig. 4 is an elastic gasket placedbetween the screen and a retaining frame or plate. Fig. 5 is theclamping or retaining plate employed to hold the screens in place. Fig.6 is a front view of the fastening devices to hold the ends of thescreen-frames. Fig. 7 is a section on the line x x of Fig. 6. Fig. 8 isa front view of one of the ledges to support the weight of thefastening-frame and adjust its position vertically. Fig. 9 is a view ofFig. 8 at a right angle thereto.

Similar letters of reference are employed to designate like parts in thedifferent figures of the drawings.

The main member of the machine consists of a conical pan A, a base-plateA constituting a supporting-frame cast or formed integrally with anoblique channel A into which flows the pulverized ore as it escapes fromthe sides of the pan A through the openings L and the screens C.

The crushing elements in the present machine consist of the heavyrollers D, impelled by a suitable connection to the wheel E, a pinion Eand a horizontal shaft E to which the driving power is applied by apulley E, or in any other suitable manner.

The rollers D rest upon a circular die-ring G, or when in operation upona stratum of ore interposed between the rollers and dies, as will beunderstood, such machines being well known and extensively employed. o

The pan A is made flaring or of conical form, so as to attain in somedegree the aid of gravity in discharging, and for other operatingobjects that will be understood. Around its sides are a series of oblongperforations or escape-ways L, covered by the screens C, as seen in Fig.1.

The crushing machinery is inclosed by an extension A of the main frame,consisting of a cylinder made of sheet metal and provided with a spout Jthrough which broken ore is supplied to the machine.

Referring now to the screens 0 and the mechanism for supporting thesame, these are made of woven-wire fabric, or of perfo rated sheetmetal, Fig. 3 representing one of the former as it is prepared for useon the machine shown in Figs. 1 and 2.

The screens 0 are made oblong and rectangular in form, large enough tocover the per forations L when the screen is bent to fit around theconical contour of the pan A, the edges overlapping a varying amount toaccommodate the oblique and curved surfaces.

On the inside of the screens 0 are placed elastic gaskets M, preferablyof india-rubber, and over this the retaining-frames N, held by the keys0, fitting in the grooved ledges Q, cast on the main frame A, a piece ofwood P being inserted between the keys 0 and the retaining-plates N, asseen in Figs. 2 and 7. The grooves in these ledges Q. do not extendthrough the bottom, but terminate, leaving a step or ledge to sustainthe screenframes N, as shown by dotted lines in Fig. 6. These strips ofwood P, being elastic and adhesive in nature, are to guard againstdisplacement of the keys 0 by the jar and concussion of the crushingaction, also to prevent the keys from being jammed by corrosion. Thus itwill be seen that the screens 0 present the same form and areaexternally as when out in a curved form to fit around the conical orflaring sides of the pan A.

At the bot-tom of the screen-frames N are lugs R, wide enough to receivea key that will press the frames and screens at the bottom close againstthe sides of the pan A, and resist any pressure that may arise frombanking the crushed ore against the screens at the bottom on the inside.

As the principal impingement of the partlycrushed material falls againstthe inside of the screens C at their bottom, near the plane of thedie-ring G, orapproximately in that plane, the principal wear takesplace below the center of the screens C, which if made in the usual formto fit the openings L, the screens would have to be replaced as soon asworn at the bottom, but with my improvement the members 0, P, and N areremoved, the screens C inverted, presenting a comparatively new surfacein the plane of principal wear, thus securing a double service underordinary conditions of use.

Having thus explained the nature and objects of my invention and themanner of its application, what I claim as new, and desire to secure byLetters Patent, is

1. In an ore-crushing machine, a pan havin g an outwardly-flaringperipheral wall and openings formed in said wall, and provided withinvertible discharge-screens.

2. In an ore-crushing machine, the combination with a pan having anoutwardly-flaring peripheral wall, of openings formed in said wall,invertible discharge-screens, locking-keysfor said screens, gaskets atthe rear ofsaid screens, and a wedge at the rear of the keys to preventdisplacement of the same.

3. In an ore-crushing machine, the combination with a pan having anoutwardly-flaring peripheral wall provided with openings, of invertibledischarge-screens for said openings, crushing-rollers in the pan,gearing to rotate said rollers, a hopper for reception of the material,and an oblique channel for escape of the crushed ore.

In testimony whereof I have hereunto affixed my signature in thepresence of two witnesses.

EDIVARDS P. JONES. v

\Vitnesses:

ALFRED A. ENQUIST, WILsoN D. BENT, Jr.

